The Asian Water Development Outlook (AWDO) 2020 assesses national water security across Asia and the Pacific, focusing on five key dimensions: rural, economic, urban, environmental, and water-related disaster. Despite considerable achievements in Asia and the Pacific since the AWDO 2013 edition, 1.5 billion people in rural areas and 0.6 billion in urban areas still lack adequate water supply and sanitation. Sound water management and access to reliable service delivery remain vital to inclusive economic growth and social well-being, especially after the coronavirus disease (COVID-19) pandemic. This edition includes two new sections highlighting the importance of finance and governance to water security as well as case studies demonstrating how the AWDO has influenced policy development in four countries.